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            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-Lombok简介及基本使用"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 : Lombok简介及基本使用</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#简介"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">简介</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#开发环境"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">开发环境</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#常见异常"><span class="post-toc-number">1.3.</span> <span class="post-toc-text">常见异常</span></a></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#使用Lombok前后对比"><span class="post-toc-number">1.4.</span> <span class="post-toc-text">使用Lombok前后对比</span></a></li></ol></li></ol>
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        <h1 class="post-card-title">Lombok简介及基本使用</h1>
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            <time class="post-time" title="2019-08-13 20:46:07" datetime="2019-08-13T20:46:07.000Z"  itemprop="datePublished">2019-08-13</time>

            


            

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            <h2 id="学习笔记-Lombok简介及基本使用"><a href="#学习笔记-Lombok简介及基本使用" class="headerlink" title="学习笔记 : Lombok简介及基本使用"></a>学习笔记 : Lombok简介及基本使用</h2><h3 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h3><p><em>问题引入 : 开发中经常需要写的JavaBean,都需要花时间去添加相应的getter/setter,也许还要去写构造器、equals等方法,而且需要维护,当属性多时会出现大量的getter/setter方法,这些显得很冗长也没有太多技术含量,一旦修改属性,就容易出现忘记修改对应方法的失误哟~</em></p>
<p><em>Lombok能通过注解的方式,在编译时自动为属性生成<code>构造器</code>、<code>getter/setter</code>、<code>equals</code>、<code>hashcode</code>、<code>toString</code>方法. 出现的神奇就是在源码中没有getter和setter方法,但是在编译生成的字节码文件中有getter和setter方法. 这样就省去了手动重建这些代码的麻烦,既而达到简化代码,提高开发人员的开发效率的目的</em></p>
<ul>
<li>优点 :<ul>
<li>能通过注解的形式自动生成构造器、getter/setter、equals、hashcode、toString等方法,提高了一定的开发效率</li>
<li>让代码变得简洁,不用过多的去关注相应的方法</li>
<li>属性做修改时,也简化了维护为这些属性所生成的getter/setter方法等</li>
</ul>
</li>
<li>缺点 :<ul>
<li>不支持多种参数构造器的重载</li>
<li>虽然省去了手动创建getter/setter方法的麻烦,但大大降低了源代码的可读性和完整性,降低了阅读源代码的舒适度</li>
</ul>
</li>
<li>总结 : <ul>
<li>Lombok虽然有很多优点,但Lombok更类似于一种IDE插件,项目也需要依赖相应的jar包. Lombok依赖jar包是因为编译时要用它的注解,为什么说它又类似插件 ? 因为在使用时Eclipse或IntelliJ IDEA都需要安装相应的插件,<code>在编译器编译时通过操作AST( 抽象语法树 )改变字节码生成,变向的就是说它在改变Java语法. 它不像Spring的依赖注入或者MyBatis的ORM一样是运行时的特性,而是编译时的特性</code></li>
</ul>
</li>
</ul>
<h3 id="开发环境"><a href="#开发环境" class="headerlink" title="开发环境"></a>开发环境</h3><ol>
<li><p><em>添加Maven依赖 :</em></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.projectlombok<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>lombok<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.16.20<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">scope</span>&gt;</span>provided<span class="tag">&lt;/<span class="name">scope</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>安装IDEA(<code>IntelliJ Lombok plugin</code>)插件</em></p>
</li>
</ol>
<h3 id="常见异常"><a href="#常见异常" class="headerlink" title="常见异常"></a>常见异常</h3><ol>
<li><p><em>(已添加<code>lombok</code>依赖情况下)抛出此异常,(IDEA环境)解决方案:安装<code>IntelliJ Lombok plugin</code>并启用<code>Enable annotation processing</code></em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">Warning:(49, 8) java: lombok.javac.apt.LombokProcessor could not be initialized. Lombok will not run during this compilation: java.lang.IllegalArgumentException: com.sun.tools.javac.main.DelegatingJavaFileManager$DelegatingSJFM extends com.sun.tools.javac.main.DelegatingJavaFileManager implements javax.tools.StandardJavaFileManager</span><br><span class="line">  	at lombok.javac.apt.LombokFileObjects.getCompiler(LombokFileObjects.java:148)</span><br><span class="line">  	at lombok.javac.apt.InterceptingJavaFileManager.&lt;init&gt;(InterceptingJavaFileManager.java:40)</span><br><span class="line">  	at lombok.javac.apt.LombokProcessor.placePostCompileAndDontMakeForceRoundDummiesHook(LombokProcessor.java:165)</span><br><span class="line">  	at lombok.javac.apt.LombokProcessor.init(LombokProcessor.java:87)</span><br><span class="line">  	at lombok.core.AnnotationProcessor$JavacDescriptor.want(AnnotationProcessor.java:87)</span><br><span class="line">  	at lombok.core.AnnotationProcessor.init(AnnotationProcessor.java:140)</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>JDK版本bug,解决方案:重置JDK版本,Project Structure—&gt;Porject settings—&gt;Project : 将<code>Project SDK</code>设置为:<code>9(java version&quot;9.0.4&quot;)</code>, <code>language level</code>设置为<code>8</code>,详情操作请参考 : <a href="https://github.com/YUbuntu0109/YUbuntu0109.github.io/blob/ce0545de04d3cfc9b328a1760bb5f3c84d322362/source/_posts/%E8%AF%A6%E8%A7%A3%E5%9C%A8IDEA%E4%B8%AD%E5%A4%9A%E5%A4%84%E8%AE%BE%E7%BD%AEJDK%E5%8F%8A%E5%85%B6%E5%8C%BA%E5%88%AB.md" target="_blank" rel="noopener">IDEA为何多处设置JDK,有什么区别呢 ?</a></em></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Warning:(9, 8) java: lombok.javac.apt.LombokProcessor could not be initialized. Lombok will not run during this compilation: java.lang.IllegalArgumentException: com.sun.tools.javac.main.DelegatingJavaFileManager$DelegatingSJFM extends com.sun.tools.javac.main.DelegatingJavaFileManager implements javax.tools.StandardJavaFileManager</span><br><span class="line">  	at lombok.javac.apt.LombokFileObjects.getCompiler(LombokFileObjects.java:148)</span><br><span class="line">  	at lombok.javac.apt.InterceptingJavaFileManager.&lt;init&gt;(InterceptingJavaFileManager.java:40)</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h3 id="使用Lombok前后对比"><a href="#使用Lombok前后对比" class="headerlink" title="使用Lombok前后对比"></a>使用Lombok前后对比</h3><ol>
<li><p><em>一个未使用Lombok的普通JavaBean</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.lombok.bean;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.apache.log4j.Logger;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> Integer id;</span><br><span class="line">    <span class="keyword">private</span> String name;</span><br><span class="line">    <span class="keyword">private</span> String password;</span><br><span class="line">    <span class="keyword">private</span> Logger log = Logger.getLogger(<span class="keyword">this</span>.getClass());</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">User</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">User</span><span class="params">(Integer id, String name, String password)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.id = id;</span><br><span class="line">        <span class="keyword">this</span>.name = name;</span><br><span class="line">        <span class="keyword">this</span>.password = password;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> Integer <span class="title">getId</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> id;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setId</span><span class="params">(Integer id)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.id = id;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> name;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.name = name;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">getPassword</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> password;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setPassword</span><span class="params">(String password)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.password = password;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">toString</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">"User&#123;"</span> +</span><br><span class="line">                <span class="string">"id="</span> + id +</span><br><span class="line">                <span class="string">", name='"</span> + name + <span class="string">'\''</span> +</span><br><span class="line">                <span class="string">", password='"</span> + password + <span class="string">'\''</span> +</span><br><span class="line">                <span class="string">'&#125;'</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>一个使用Lombok的普通JavaBean( 使用Lombok注解达到与上述JavaBean同样的效果 )~</em></p>
</li>
</ol>
<ul>
<li><code>@Data</code> : 注解在类上,提供类所有属性的 getting 和 setting 方法,此外还提供了equals、canEqual、hashCode、toString方法</li>
<li><code>@Setter</code> : 注解在属性上,为属性提供 setting 方法</li>
<li><code>@Getter</code> : 注解在属性上,为属性提供 getting 方法</li>
<li><code>@Log4j</code> : 注解在类上,为类提供一个属性名为 log 的 log4j 日志对象</li>
<li><code>@ToString</code> : 注解在类上,为类提供一个 toString 方法</li>
<li><code>@NoArgsConstructor</code> : 注解在类上,为类提供一个无参的构造方法</li>
<li><code>@AllArgsConstructor</code> : 注解在类上,为类提供一个全参的构造方法</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.lombok.bean;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> lombok.AllArgsConstructor;</span><br><span class="line"><span class="keyword">import</span> lombok.Data;</span><br><span class="line"><span class="keyword">import</span> lombok.NoArgsConstructor;</span><br><span class="line"><span class="keyword">import</span> lombok.ToString;</span><br><span class="line"><span class="keyword">import</span> lombok.extern.log4j.Log4j;</span><br><span class="line"></span><br><span class="line"><span class="meta">@Data</span></span><br><span class="line"><span class="meta">@Log</span>4j</span><br><span class="line"><span class="meta">@ToString</span></span><br><span class="line"><span class="meta">@NoArgsConstructor</span></span><br><span class="line"><span class="meta">@AllArgsConstructor</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserWithLombok</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> Integer id;</span><br><span class="line">    <span class="keyword">private</span> String name;</span><br><span class="line">    <span class="keyword">private</span> String password;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">outLogInfo</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        log.info(<span class="string">"the message object to log ~"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><em>参考链接 :</em></p>
<ul>
<li><a href="https://github.com/rzwitserloot/lombok" target="_blank" rel="noopener">https://github.com/rzwitserloot/lombok</a></li>
<li><a href="https://www.cnblogs.com/heyonggang/p/8638374.html" target="_blank" rel="noopener">https://www.cnblogs.com/heyonggang/p/8638374.html</a></li>
</ul>

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